One day, when their son returns home after a long time, he finds that he has become a cute girl (a transsexual). The parents are so surprised that they are speechless. However, the father becomes aroused by his son's transformation into a super high-class transsexual young woman... "Don't thrust your prostate so violently...!" he says, as the son's penis expands to a rock hard state, and he falls for the lewd, perverted transsexual.